Improvement in door-bells



A. L.- SWAN, Door- Bells.

No.158.,446. Patentedlan.5,1875.

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1 a Z I .7' e a a a j S WITNESSES I INVENTOR I Attorneys YNE 6 RAFHIGBD.PH OTOLITH. 39844 PAR? PLACE, FLY.

UNITED STATES PATENT QEFIoE.

AMos L. sWAN, OF CHERRY VALLEY, NEW YORK.

IMPROVEMENT IN DOOR-BELLS.

I Specification forming part of Letters Patent No. 158,446, dated January 5, 1875 application filed April 11, 1874.

To all whom it may concern:

Be it known that I, AMOS L. SWAN, of Cherry Valley, in the county of()tsego and State of New York, have invented a new and valuableImprovement in Door-Bells; and I do hereby declare that the following isa full, clear, and exact description of the construction and operationof. the same, reference being had to the annexed drawings, making a partof this specification, and to the letters and figures of referencemarked thereon.

Figure 1 of the drawing is a representation of a plan view of my bell,and Fig. 2 is a sec tional view of the same. Fig. 3 is an outside viewof my bell.

This invention has relation to improvements in house and signal gongbells; and it consists, first, in the cam and swinging sector, pivotedtogether and arranged in connection with the hammer-lever, a pivotedconnectingarm, and a stop-pin, whereby the desired motion is given tothe hammer; second, in the construction and novel arrangement of thepivoted key, connecting-arm, and cam, whereby a double orsingle actionof the hammer may be secured at option.

1n the accompanying drawings, the letter A indicates a sector-shapedlever, which is pivoted to the under side of the base-plate B, which isrecessed underneath to receive the sector and the remaining parts of theoperating mechanism, presently to be described. The plate B is providedwith a circumscribin g flange, b, bounding the recess a, which isperforated at c for the passage of the pull-wire cl, and is providedwith lugs 6 extending outward from its edge, for the passage of suitablefastening-screws. A post, 0, extends upward from the upper side of thebed-plate for the attachment of the bell D. The sector-lever A isslotted at f upon a curve having its center at the pivot g of saidlever, said slot playing about a stop, h, which is fixed to thebed-plate and extends through the slot. To one horn, 7c, of the sectoris attached the pull-wire cl, and to the other, k, one end of anactuatin g-sprin g, a, which is secured to the bed-plate. The

play of the sector is determined by a stop, b. To the free end of thesector at z, 011 the opposite side of the slot from the pivot g, and

i at the middle of the curve, is pivoted the cam E, one end of which isrecessed or notched-at c, to provide two horns, cl and d, for engagementwith the stop h. The other end of the cam is pivoted at z to aconnecting-arm, F, which is, in turn, pivoted at z to the crank c of thehammer G, the shank of which is journaled at f by passing it through aperforation through the bed-plate. A spring, y, en-

gages with a horn, h, at the crank end of the arm F, and serves to keepthis arm pressed toward the cam E, the operation of the spring beinglimited by a stop, l, secured to the bedplate, and engaging with thecrank 6, when a double action of the hammer is required. H indicates akey-stop, pivoted to the bed-plate at the side of the arm F.

When a single stroke only is desired, this key is turned toward the arm,thereby preventing the cam from moving the full length of the returnstroke, and thus keeping the hammer from the bell on this return stroke.

0n the upper side of the bed-plate is secured an arm, K, to which isattached a bumper, L, of rubber or other elastic material, to receivethe back stroke of the hammer, thereby instantly overcoming itsmomentum, and communicating force thereto in the direction of the bell.

This is of great importance in gongs of large size, where the hammer isof considerable weight. With this improvement, the momentum or strengthof stroke of the hammer against the bell is directly proportioned to therapidity of the pull upon the bellwire, which is not the case when thereacting device is not employed.

By means of the raised and flanged bedpivots g and z are arranged inline across the bed plate B. The pivots z and z are transverselymovable, with reference to this line, when the pull-wire is actuated,the first moving with the sector, and the last being thrown, by theengagement of the stop It with the horns d and d, first in the directionof the by Letters Patent, is

l. The combination, with the slotted sectorlever A, and the horned cam Epivoted thereto, of the fixed stop h, connecting said sectorleyer and0am, substantially as specified.

2. The combination, with the sector-lever A and horned cam E, pivotedtogether, of the] fixed stop It, hammer-crank 0, spring 9, connection F,and stop H, adjustable for single or double strokes, substantially asspecified.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

AMOS L. SWAN.

\Vitnesses:

OHAs. MCLEAN, F. W. MoRsE.

